Sentences with phrase «ozone levels declined»
EPA data shows ozone levels declined 18 percent between 2008 and 2013.
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For example, he says, the cosmic ray effect could explain why CFC and ozone levels decline during the Antarctic winter, when ultraviolet radiation is scarce.
If ozone levels decline, for instance, temperatures in the stratosphere will fall.
Not exact matches
Levels of ozone - eating bromine in the lower atmosphere are declining faster than predicted.
Mid-1980s: Ozone layer sees a noticeable decline from its average level of about 300 DU.
Within 24 hours of the blackout, sulfur dioxide levels dropped by 90 percent, and ozone declined by 50 percent.
On very smoggy days (top panel), ozone levels have declined in the east, as indicated by the blue circles.
European mean ground ozone levels are declining, not rising as could be expected from a possible warming trend.
decline in ozone levels between 1980 and 2007.
It's worth noting that most model projections suggest that the SAM trend may level off for a while as the ozone hole gradually declines, but those same model projections suggest the SAM trend will recover as CO2 continues to rise.
decline in ozone levels between 1980 and 2007.
And, «There has indeed been a slight decline in global ozone levels, probably due to sunspot activity and natural dynamics in the atmosphere.»
Today — rising natural gas use plays a key role in falling emissions of carbon dioxide — even as levels of methane and ozone decline.
While atmospheric levels of ozone - depleting chemicals were rapidly increasing before the Protocol was ratified, emissions of nearly all of these chemicals have declined substantially and atmospheric levels of most of these gases have decreased in the intervening 2 decades.
A good example is the consensus of chemistry models that projected a slow decline in stratospheric ozone levels in the 1980s, but did not predict the emergence of the Antarctic ozone hole because they all lacked the equations that describe the chemistry that occurs on the surface of ice crystals in cold polar vortex conditions — an «unknown unknown» of the time.